diff options
| author |   Wolfram Sang <w.sang@pengutronix.de> | 2011-12-13 18:34:01 +0100 |
|---|---|---|
| committer |   Grant Likely <grant.likely@secretlab.ca> | 2012-04-05 21:24:06 -0700 |
| commit | fc3a1f04f5040255cbc086c419e4237f29f89f88 (patch) | |
| tree | 3ece85d636a3ceeffb157b77ee51b4745cbdf2d9 | |
| parent | Linux 3.4-rc1 (diff) | |
| download | linux-dev-fc3a1f04f5040255cbc086c419e4237f29f89f88.tar.xz linux-dev-fc3a1f04f5040255cbc086c419e4237f29f89f88.zip | |
gpio: add flags to export GPIOs when requesting
Introduce new flags to automatically export GPIOs when using the convenience
functions gpio_request_one() or gpio_request_array(). This eases support for
custom boards where lots of GPIOs need to be exported for customer
applications.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
| -rw-r--r-- | Documentation/gpio.txt | 3 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib.c | 12 | ||||
| -rw-r--r-- | include/linux/gpio.h | 5 |
3 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index 620a07844e8c..e08a883de36e 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -322,6 +322,9 @@ where 'flags' is currently defined to specify the following properties: * GPIOF_OPEN_DRAIN - gpio pin is open drain type. * GPIOF_OPEN_SOURCE - gpio pin is open source type. + * GPIOF_EXPORT_DIR_FIXED - export gpio to sysfs, keep direction + * GPIOF_EXPORT_DIR_CHANGEABLE - also export, allow changing direction + since GPIOF_INIT_* are only valid when configured as output, so group valid combinations as: diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 5a75510d66bb..566d0122d832 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1302,8 +1302,18 @@ int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) (flags & GPIOF_INIT_HIGH) ? 1 : 0); if (err) - gpio_free(gpio); + goto free_gpio; + + if (flags & GPIOF_EXPORT) { + err = gpio_export(gpio, flags & GPIOF_EXPORT_CHANGEABLE); + if (err) + goto free_gpio; + } + + return 0; + free_gpio: + gpio_free(gpio); return err; } EXPORT_SYMBOL_GPL(gpio_request_one); diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 6155ecf192b0..af511a682925 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -20,6 +20,11 @@ /* Gpio pin is open source */ #define GPIOF_OPEN_SOURCE (1 << 3) +#define GPIOF_EXPORT (1 << 2) +#define GPIOF_EXPORT_CHANGEABLE (1 << 3) +#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT) +#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE) + /** * struct gpio - a structure describing a GPIO with configuration * @gpio: the GPIO number |